// LambdaNode.cs
//
// Copyright (c) 2008 Jérémie "Garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//

using System;
using System.Collections.Generic;

using Irony.Compiler;
using Irony.Compiler.AST;

using Microsoft.Scripting.Ast;
using Microsoft.Linq;
using Microsoft.Linq.Expressions;

namespace Bechamel
{
	
	public class LambdaNode : BechamelNode
	{
		AstNode param;
		AstNode body;

		static int number = int.MinValue;
		LambdaBuilder builder;
		
		public LambdaNode(NodeArgs args, AstNode param, AstNode body)
			: base(args)
		{
			this.param = param;
			this.body = body;
		}

		public override Expression GenerateExpression (ETGenerator generator)
		{
			string name = "<lambda" + System.Threading.Interlocked.Increment(ref number);
			builder = Utils.Lambda(typeof(Object), name);

			List<ParameterExpression> ps = new List<ParameterExpression>();
			foreach (AstNode node in param.ChildNodes) {
				IdentifierNode identifier = node as IdentifierNode;
				if (identifier == null)
					continue;
				ps.Add(builder.Parameter(typeof(Object), identifier.Name));
			}
			//Console.WriteLine("FunctionCallNode : {0}", body.ChildNodes[0] is FunctionCallNode);
			Expression bodyExpr = generator.GetExpressionFromAst(body.ChildNodes[0], ps);

			builder.Body = bodyExpr;

			return Expression.Call(typeof(Function).GetMethod("Create"),
			                       builder.MakeLambda(typeof(BechamelCallTarget)));
		}
	}
}
